Thermal hairbrush



FIGS. 1A and 1B are front view of a thermal hairbrush, the left, right and rear view being identical to the front view;

FIG. 2 is bottom plan view of the hair brush; and,

FIG. 3 is a top view of the hairbrush.

The broken line showing on the drawing disclosure is for illustrative purposes only and forms no part of the claimed design. 

I claim the ornamental design for the thermal hairbrush, as shown. 